// Copyright 2006 - Ricardo Stuven (rstuven@gmail.com)
//
// This file is part of MsSqlSpatial.
// MsSqlSpatial is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// MsSqlSpatial is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public License
// along with MsSqlSpatial; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 

using System.ComponentModel;
using System.Data.SqlTypes;
using GeoAPI.Geometries;
using GisSharpBlog.NetTopologySuite.Geometries;
using Microsoft.SqlServer.Server;
using MsSqlSpatial;

public partial class UserDefinedFunctions
{
    /// <summary>
    /// Generates a Polygon from a LineString.
    /// </summary>
    [SqlFunction(IsDeterministic = true, DataAccess = DataAccessKind.Read)]
    public static SqlBytes Polygon(SqlBytes ewkb, [DefaultValue(-1)] SqlInt32 srid)
    {
        IGeometry geometry = ConvertGeometry.ToGeometry(ewkb);
        if (geometry is ILineString)
        {
            return ConvertGeometry.ToSqlBytes(new Polygon(new LinearRing(geometry.Coordinates)), srid);
        }
        else if (geometry is ILinearRing)
        {
            return ConvertGeometry.ToSqlBytes(new Polygon((LinearRing) geometry), srid);
        }
        return SqlBytes.Null;
    }
} ;